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A small-sized (radiator sime 21 times 9 mm) coupled monopole antenna for concurrent operation mode is presented. The proposed antenna operates in four service bands with two feed ports: port 1: WiBro (2.3- 2.4 GHz) and WLAN 802.11a (5.15-5.35 GHz); port 2: m-RFID (908.5-914 MHz) and m-WiMAX (3.4-3.6 GHz). To increase the isolation between the two ports, two filters are used in both feed-lines. The frequency bands of the proposed antenna can be used at the same time for concurrent operation mode.